<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>

<body>

  <form id="form1">
    <!-- autocomplete="off" 阻止鼠标移入表单后的默认行为 -->
    <input type="text" name="uname" autocomplete="off" />
    <input type="password" name="upwd" />
    <button type="submit">提交</button>
  </form>

  <script>
    // 接口地址： http://www.liulongbin.top:3006/api/formdata
    // 请求方式： POST

    // // 1. 获取到 form 表单元素
    // const form = document.querySelector('#form1')
    // // 2. 阻止表单的默认提交行为
    // form.addEventListener('submit', function (e) {
    //   e.preventDefault()

    //   // 3. 创建 FormData，快速获取到 form 表单中的数据
    //   const fd = new FormData(this)
    //   const xhr = new XMLHttpRequest()
    //   xhr.open('POST', 'http://www.liulongbin.top:3006/api/formdata')
    //   xhr.send(fd)
    //   xhr.onreadystatechange = function () {
    //     if (xhr.readyState === 4 && xhr.status === 200) {
    //       console.log(JSON.parse(xhr.responseText))
    //     }
    //   }
    // })

    const form = document.querySelector('#form1')
    form.addEventListener('submit',function(e){
      e.preventDefault()

      const fd = new FormData(this)
      const xhr = new XMLHttpRequest()
      xhr.open('POST','http://www.liulongbin.top:3006/api/formdata')
      xhr.send(fd)
      xhr.onreadystatechange = function(){
        if(xhr.readyState === 4 && xhr.status === 200){
          console.log(JSON.parse(xhr.responseText))  
        } 
      }
    })



  </script>

</body>

</html>